WP - write log in wordpress

Write log in wordpress: 

functions.php:

if (!function_exists('write_log')) {

  function write_log($log) {

    if (true === WP_DEBUG) {

      if (is_array($log) || is_object($log)) {

        error_log(print_r($log, true));

      } else {

        error_log($log);

      }

    }

  }

}

Then call write_log() in below way:
write_log("SOME TEXT");
Or
write_log($variable_to_test);

.:Happy coding:.